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Field strength meter
This circuit measures the strength of a radiated signal from a transmitter. It is commonly used by model airplane builders to check whether their transmitter are really transmitting the radio signal. Using this FS meter, one can quickly determine whether the problem lies on the transmitter or the receiver module.
A single transistor T1 is the [...]
Full duplex audio line
This full duplex audio line circuit enables two audio signals in opposing directions to flow simultaneously through a common twisted pair line. And it does that without complicated communication technology. This technique called full duplex is not really new. It is common in telephone technology. However, the telephone uses a carrier signal. This circuit on [...]
FM transmitter with SMD
Let’s construct a low-power FM transmitter using surface-mount devices (SMD) that will be received with a standard FM radio. Soldering surface mounted devices is not so hard and actually is quite easy. There are many designs for small FM transmitters but they have some problems. First, you need an audio amplifier to get enough modulation. [...]
